How to Use the HubSpot Marketing Hub MCP in LangChain

Q: Can I trace HubSpot Marketing Hub tool calls in LangChain using LangSmith?

Yes. Every call to hslistforms or hsformsubmissions shows up as a distinct step in your LangSmith trace. You see the exact latency, token count, and raw HubSpot API response.

Q: Can my LangChain agent edit emails or campaigns?

No. This server only provides read operations like hslistmarketingemails and hslistcampaigns to keep your marketing assets safe. Your agent cannot overwrite or delete any active HubSpot data.

Run LangChain agents that query your live HubSpot marketing assets using this lightweight MCP Server.

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Connect HubSpot Marketing Hub MCP to LangChain

Create your Vinkius account to connect HubSpot Marketing Hub to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup HubSpot Marketing Hub with LangChain

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Audit active campaigns inside LangChain chains

`hs_list_campaigns` pulls live campaign metrics, names, and states directly into your LangChain run. Your agent reads this data to decide which assets need attention without you opening a browser. We feed this raw campaign metadata directly into the next step of your chain. With LangSmith tracing, you see exactly how the agent parsed the active marketing initiatives.

Trace lead generation with this HubSpot MCP Server

`hs_list_forms` finds your active lead capture forms, giving your LangChain agent the exact form IDs it needs. This MCP integration makes it easy. Once the agent has the ID, it calls `hs_form_submissions` to fetch the actual visitor entries and field values. This turns form verification into a single, observable chain step.

Connect email and page performance to your agent

`hs_list_marketing_emails` and `hs_list_landing_pages` expose your current email drafts and public landing page URLs to your LangChain agent. The agent compares publish statuses to find unpublished drafts or broken URLs. You build multi-step reasoning pipelines that flag inconsistencies between your active pages and email campaigns. It uses your live HubSpot data to feed downstream database steps in the same chain.

Setup guide

Set up HubSpot Marketing Hub MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes HubSpot Marketing Hub tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "hubspot-marketing-hub-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent HubSpot Marketing Hub transactions"
    })
    print(result["messages"][-1].content)

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Common questions about HubSpot Marketing Hub MCP in LangChain

Install the adapter, initialize the server client, and call `client.get_tools()`. You pass this array directly to `create_agent` so your LangChain agent can call `hs_list_campaigns` natively.

Yes. Every call to `hs_list_forms` or `hs_form_submissions` shows up as a distinct step in your LangSmith trace. You see the exact latency, token count, and raw HubSpot API response.

Yes. You can combine this server with other endpoints in a single `MultiServerMCPClient` instance. LangChain then lets your agent select the right tool from any connected server dynamically.

No. This server only provides read operations like `hs_list_marketing_emails` and `hs_list_campaigns` to keep your marketing assets safe. Your agent cannot overwrite or delete any active HubSpot data.

The MCP Server runs in a secure, ephemeral sandbox on Vinkius and only accesses the specific form submissions requested by `hs_form_submissions`. No customer emails or form fields are stored or cached on our servers.

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